JohmT Back in the day of TV tubes. The heaters inside of the tubes were wired in series. The heater inside the tube, when cold, had very little resistance. As they got red hot the resistance grew. To prevent large surge current when you turned on the TV, there was a large thermistor placed in series with all the heater elements. The thermistor almost looked like a power resistor. It was common for the thermistor to go bad and it was easy to replace. The thermistor prevented a large surge current when the TV was first turned on.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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